/Engine/Plugins/FX/Niagara/Source/Niagara/Classes/NiagaraScriptSourceBase.h
void GatherPreCompiledVariables ( const [FString](API\Runtime\Core\Containers\FString) & InNamespaceFilter, [TArray](API\Runtime\Core\Containers\TArray)< [FNiagaraVariable](API\Plugins\Niagara\FNiagaraVariable) > & OutVars ) const